Xml and databases

Small shared pool Small database buffer cache Small redo log buffer cache Missing indexes Rollback segments and undo tablespace Sort area size incorrectly set Assorted

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After completing this lesson, you should be able to do the following: Use the Oracle tuning methodology to diagnose and resolve performance problems Use Oracle tools to diagnose performance problems Understand the goals of the workshop

14p trinh02 28-01-2013 69 5   Download

After completing this lesson, you should be able to do the following: Describe different system architectures Describe the primary steps of OS tuning Identify similarities between OS and DB tuning Understand virtual memory and paging Explain the difference between a process and a thread

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Auditing If an unauthorized user is deleting data, then the DBA might decide to audit all connections to the database and all successful and unsuccessful deletions from all tables in the database. The DBA can gather statistics about which tables are being updated, how many logical inputs/outputs (I/Os) are performed, and how many concurrent users connect at peak times.

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Users and Security Security domain The database administrator defines the names of the users who are allowed to access a database. A security domain defines the settings that apply to the user. Authentication mechanism A user who requires access to the database can be authenticated by one of the following: Data dictionary Operating system Network The means of authentication is specified at the time the user is defined in the database and can be altered later. This lesson covers authentication by database and by operating system only.

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This workshop covers: Creating tables and sequences Modifying data in the tables Modifying table definitions Creating views Writing scripts containing SQL and iSQL*Plus commands Generating a simple report

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After completing this lesson, you should be able to do the following: Identify issues associated with managing users in an Oracle Shared Server environment Configure the Oracle Shared Server environment to optimize performance Diagnose and resolve performance issues with Oracle Shared Server processes

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After completing this lesson, you should be able to do the following: Monitor and size the redo log buffer Monitor and size the Java pool Control the amount of Java session memory used by a session

16p trinh02 28-01-2013 50 5   Download

Control File The control file is a small binary file necessary for the database to start and operate successfully. Each control file is associated with only one Oracle database. Before a database is opened, the control file is read to determine whether the database is in a valid state to use. A control file is updated continuously by the Oracle server during database use, so it must be available for writing whenever the database is open. The information in the control file can be modified only by the Oracle server; no database administrator or end user can edit the control file....

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Built-In Database Objects In addition to creating the database files, several other structures are created. Data dictionary: Contains descriptions of the objects in the database Dynamic performance tables: Contains information used by the database administrator (DBA) to monitor and tune the database and instance PL/SQL packages: Program units adding functionality to the database. These packages are created when the catproc.sql script is run after the CREATE DATABASE command. PL/SQL packages will not be discussed within the scope of this course.

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After completing this lesson, you should be able to do the following: Define the roles associated with the database tuning process Describe the dependencies between tuning in different development phases Describe service level agreements Identify tuning goals Identify common tuning problems Employ tuning activities during developmentand production Balance performance and safety trade-offs

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Before a database is created, the UNIX environment must be configured and the Oracle9i server must have already been installed. Four environment variables must be set: ORACLE_HOME, ORACLE_SID, PATH, LD_LIBRARY_PATH. ORACLE_HOME is the full path to the top directory in which the Oracle9i Server is installed. The directory for ORACLE_HOME should be supplied by the person who installed the server, usually the UNIX administrator or the DBA. ORACLE_SID is a user-definable name assigned to an instance of a database.

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Course Objectives This course is the first in a series of courses that cover the core database administrator tasks. The tasks covered in this course are: Outlining the Oracle architecture Planning and creating databases Managing the memory, process, physical, and logical structures Managing database users by controlling and monitoring their actions Using the Globalization Support features

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Workshop Methodology Group-Oriented and Interactive Structure The workshop is structured to allow individuals to work in groups to perform database backup, restore, and recovery operations. Each group is encouraged to share its approach to resolving database failures with other groups in the class. Intensive Hands-On Diagnosis and Problem Resolution The intent is to provide you with as much hands-on experience as possible to diagnose and work through backup and recovery scenarios.

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Cross Checks of RMAN Backups and Copies Performing a cross check provides you with a way to ensure that data about backup sets and image copies in the RMAN repository is synchronized with corresponding data on disk or in the media management catalog. You can use the LIST command to obtain a report of the backups and copies that you have made and then use the CROSSCHECK command to check that these files still exist. If RMAN cannot find a file, it updates the repository records to EXPIRED. You can determine which files are marked EXPIRED by issuing a LIST EXPIRED command....

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Using Oracle Enterprise Manager You can use the Recovery Wizard to restore and recover your database. On the Range Selection page you must enter a date and time to restore to a previous point. You use Instance Management or the Console to open the database after the job has completed. You can view the status of the job by selecting the Active and History page tabs in the Console’s Job window.

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Restoration and Datafile Media Recovery Using RMAN RMAN automates the procedure for restoring files. When you issue the RESTORE command, RMAN uses a server session to restore the correct backups and copies. The RMAN repository is used to select the best available backup set or image copies to use in the restoration. By default, RMAN does not restore a file if the file is already in the correct place and its header contains the correct information. In releases before Oracle9i, the files were always restored.

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Client-Server Application Connection Oracle Net enables a network connection between a client and an Oracle database server. Oracle Net is a software component that resides on both the client and on the Oracle database server. It is layered on top of the network protocol. When a connection is initiated from a client to the Oracle database server, data is passed down a stack on the client, over the network, and up a similar stack to the Oracle database server.

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[ Team LiB ] Recipe 4.13 Updating Data Asynchronously Using Message Queuing Problem You need to asynchronously update data on a database on system that is not always connected. Solution You must use message queuing and an XML DiffGram to

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Writing and Reading XML Using a DataSet Object XML is a convenient format for moving information around. You can write out the contents of the DataTable objects contained in a DataSet to an XML file using the WriteXml() method

8p daisuphu 29-07-2010 143 10   Download